Fixes chacl help text to be consistent with actual syntax
Fixes chacl help text to be consistent with actual syntax


craigcitro/gsutil,mattdr/gsutil,fishjord/gsutil,GoogleCloudPlatform/gsutil,ttiurani/gsutil,chriskuehl/gsutil-debian,dtjackson/gsutil,dimfeld/gsutil,GoogleCloudPlatform/gsutil,BrandonY/gsutil